AERCO BMK 6000 - Manual (Page 88)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
Page 88 of 210 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0086_0D
03/20/14
Ph.: 800-526-0288
GF-133
6.10 PURGE SWITCH OPEN DURING PURGE
The Purge Switch (and Ignition Switch) is located on the Air/Fuel Valve. To check the switch,
proceed as follows:
Purge Switch Open During Purge
1. Set the unit’s ON/OFF switch to the OFF position. Place the unit in manual mode and set
the valve position between 25% and 30%.
2. Remove the Air/Fuel Valve cover by rotating the cover counterclockwise to unlock it (see
Figure 6-7).
3. Remove one of the two wires (#171 or #172) from the Purge Switch (Figure 6-8).
4. Initiate a unit start sequence.
5. The unit should begin its start sequence, then shut down and display PRG SWITCH OPEN
DURING PURGE.
6. Replace the wire on the Purge Switch and depress the CLEAR button. The unit should
restart.
Figure 6-7: Air/Fuel Valve Cover Location
AIR/FUEL VALVE COVER
(ROTATE CCW TO REMOVE)